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KEYSTONE INT

Overview
  • Total Patents
    600
About

KEYSTONE INT has a total of 600 patent applications. Its first patent ever was published in 1971. It filed its patents most often in United States, Australia and EPO (European Patent Office). Its main competitors in its focus markets mechanical elements, machines and measurement are MILWAUKEE FAUCETS, ANA LIDIETH MADRIGAL CHAVARRIA and FORSAC VALVES.

Patent filings per year

Chart showing KEYSTONE INTs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Scobie William Bryce 79
#2 Kueffer Max 43
#3 Yohner Paul Anthony 31
#4 Scobie William B 31
#5 Mcneely Michael D 24
#6 Maxwell Horace J 23
#7 Killian Henry R 20
#8 Holtgraver Edward George 18
#9 Feiss Roy L 18
#10 Chou Alan F 16

Latest patents

Publication Filing date Title
AU6892798A Self-contained steam trap monitor
AU2755297A Method and apparatus for monitoring recirculation control system performance
US5823228A Valve manifold
WO9721051A1 Rotary valve with pressure energized seal
US5590684A Dual pilot manifold assembly for a safety relief valve
NZ272302A Pneumatic valve actuator; details regarding means for supplying fluid pressure to the actuator cylinder
SG30348A1 Rotary valve position indicator and method
SG32334A1 Adjustable magnet carrier for valve position indicator
AU2237895A Adjustable magnet carrier for a valve position indicator
US5549131A Automatic recirculation valve
US5579800A Rotary valve position indicator and method
US5388806A Valve assembly having improved valve seat
US5427354A Valve assembly
US5494071A Mounting system for pressure transmitters
US5469805A High visibility valve position indicator
US5439619A Steam conditioning butterfly valve
US5313976A Top entry ball valve and method of assembly
NL9301162A Seal for valve shaft.
US5307831A Safety relief valve for pressure vessels
US5333638A Automatic recirculation valve